Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..49....4l&link_type=abstract
ESO Messenger (ISSN 0722-6691), Sept. 1987, p. 4, 5.
Physics
1
M Stars, S Stars, Stellar Luminosity, Stellar Spectra, Metallicity, Stellar Color, Stellar Magnitude, Supergiant Stars
Scientific paper
The IDS spectra of a sample of Large Macellanic Cloud stars with luminosity range from M(bol) = -9 to M(bol) = -4, were analyzed, with particular attention given to the strengths of the ZrO bands, strongest at 6473 A. By the criteria of Lloyd Evens (1983), slightly stronger 6473-A features than those of more luminous M supergiants should be classified as MS stars. IDS spectra of LMC stars of spectral types M3, with M(bol) = -7; M3S, with M(bol) = -6.3; and S3/3, with M(bol) = 4.8 (the stars which are fairly close in temperature type) were closely examined. The strengths of the ZrO bands in the MS star were found to be above those in the M star and much higher than in the S star. From their position in the color-magnitude diagram, the MS stars are estimated to have masses around 5 solar masses. An analysis of spectra observed with the Reticon on the 1.5-m telescope indicated that a few stars with 6473 features like the luminous MS stars in the LMN are found among the M-type classification standards.
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